Word Summary
chxϛ: abbreviation for six hundred sixty-six
Original Word: χξϛ
Transliteration: chxϛ
Phonetic Spelling: (khee xee stig'-ma)
Short Definition: abbreviation for six hundred sixty-six
Meaning: abbreviation for six hundred sixty-six
Strong's Concordance
six hundred sixty-six.

The 22nd, 14th and an obsolete letter (stigma as a cross) of the Greek alphabet (intermediate between the 5th and 6th), used as numbers; denoting respectively 600, 60, and 6; 666 as a numeral -- six hundred threescore and six.

see GREEK stigma

Thayer's Greek Lexicon
STRONGS NT 5516: χξς

χξς, six hundred and sixty-six (chi Χ = 600; xi Ξ = 60; sigma ς' = 6), a mystical number the meaning of which is clear when it is written in Hebrew letters, קסר נרון, i. e. Νέρων Καῖσαρ, 'Nero Caesar' (sometimes the Jews write קסר for the more common קיסר, the Syriac always rSK [], cf. Ewald, Die Johann. Schriften, ii., p. 263 note; (Schürer, N. T. Zeitgesch. edition 1, § 25 III., p. 449 note); נ (nun) = 50, ר (resh) = 200, ו (waw) = 6, נ (nun) = 50, ק (qoph = 100, ס (camek) = 60, ר (resh) = 200): Revelation 13:18 R G T Tr. (For a digest of opinions respecting this much debated number see Lee in the 'Speaker's commentary' at the passage.)